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Plant seed comprising vernolic acid

a technology of vernolic acid and vernolic acid, which is applied in the field of new genetic sequences that encode the enzymes of fatty acid epoxygenase, can solve the problems of limiting the commercial utility affecting the development of genetically engineered organisms which produce these fatty acids, and affecting the commercialization of traditional plant breeding and cultivation approaches

Inactive Publication Date: 2007-09-06
COMMONWEALTH SCI & IND RES ORG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an isolated nucleic acid that encodes a fatty acid epoxygenase, which is an enzyme involved in the production of epoxy fatty acids. The nucleic acid can be used to alter the level of epoxy fatty acids in a cell, tissue, organ, or organism by expressing it and controlling its activity. The invention also provides a gene construct and a method for producing a recombinant epoxygenase polypeptide in a cell or plant. The recombinant epoxygenase can be used to produce epoxy fatty acids in a cell or tissue by incubating it with a fatty acid substrate. The invention also provides an immunologically interactive molecule that binds to the recombinant epoxygenase polypeptide.

Problems solved by technology

These fatty acids are currently produced by chemical epoxidation of vegetable oils, mainly soybean oil and linseed oil, however this process produces mixtures of multiple and isomeric forms and involves significant processing costs.
However, problems with agronomic suitability and low yield potential severely limit the commercial utility of traditional plant breeding and cultivation approaches.
However, despite the general effectiveness of recombinant DNA technology, the isolation of genetic sequences which encode important enzymes in fatty acid metabolism, in particular the genes which encode the fatty acid Δ12-epoxygenase enzymes responsible for producing 12,13-epoxy-9-octadecenoic acid (vernolic acid) and 12,13-epoxy-9,15-octadecadienoic acid, amongst others, remains a major obstacle to the development of genetically-engineered organisms which produce these fatty acids.

Method used

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  • Plant seed comprising vernolic acid
  • Plant seed comprising vernolic acid
  • Plant seed comprising vernolic acid

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0240] Characterization of epoxy fatty acids in Euphorbia lagascae and Crepis spp. Seed from the wild species Euphorbia lagascae and from various Crepis species were screened by gas liquid chromatography for the presence of epoxy fatty acids. As shown in Table 3, Euphorbia lagascae contains very high levels of the epoxy fatty acid vernolic acid in its seed oil. Seeds from Crepis palaestina were shown to contain 61.4 weight % of vernolic acid and 0.71 weight % of the acetylenic fatty acid crepenynic acid of total fatty acids (Table 3).

TABLE 3Fatty acid composition of lipids derived from seeds ofCrepis alpina, Crepis palaestina and Euphorbia lagascaeRelative distribution (weight %)aFatty acidCrepis alpinaCrepis palaestinaEuphorbiaPalmitic3.95.14.3Stearic1.32.31.8Oleic1.86.322.0Linoleic14.023.010.0Crepyninic75.00.70Vernolic061.458.0Other4.01.23.9

aCalculated from the area % of total integrated peak areas in gas liquid chromatographic determination of methyl ester derivatives of the se...

example 2

Biochemical Characterization of Linoleate Δ12-epoxygenases in Euphorbia lagascae and Crepis palaestina

[0241] The enzyme, linoleate Δ12-epoxygenase synthesizes vernolic acid from linoleic acid. Linoleate Δ12-epoxygenases derived from Euphorbia lagascae and Crepis palaestina are localized in the microsome. The enzymes from these species at least can remain active in membrane (microsome) fractions prepared from developing seeds.

[0242] Preparations of membranes from Euphorbia lagascae and assays of their epoxygenase activities were performed as described by Bafor et al. (1993) with incubations containing NADPH, unless otherwise indicated in Table 4. Lipid extraction, separation and methylation as well as GLC and radio-GLC separations were performed essentially as described by Kohn et al. (1994) and Bafor et al. (1993).

[0243] Preparations of membranes from Crepis alpina and Crepis palaestina were obtained as follows. Crepis alpina and Crepis palaestina plants were grown in green house...

example 3

Strategy for Cloning Crepis palaestina Epoxygenase Genes

[0249] Cloning of the Crepis palaestina epoxygenase genes relied on the characteristics of the C. palaestina and C. alpina enzymes described in the preceding Examples.

[0250] In particular, poly (A)+RNA was isolated from developing seeds of Crepis palaestina using a QuickPrep Micro mRNA purification kit (Pharmacia Biotechnology) and used to synthesize an oligosaccharide d(T)-primed double stranded cDNA. The double stranded cDNA was ligated to EcoRI / NotI adaptors (Pharmacia Biotechnology) and a cDNA library was constructed using the ZAP-cDNA Gigapack cloning kit (Stratagene).

[0251] Single-stranded cDNA was prepared from RNA derived from the developing seeds of Crepis alpina, using standard procedures. A PCR fragment, designated as D12V (SEQ ID NO: 7), was obtained by amplifying the single-stranded cDNA using primers derived from the deduced amino acid sequences of plant mixed-function monooxygenases.

[0252] The D12V fragment w...

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Abstract

The present invention relates generally to novel genetic sequences that encode fatty acid epoxygenase enzymes, in particular fatty acid Δ12-epoxygenase enzymes from plants that are mixed function monooxygenase enzymes. More particularly, the present invention exemplifies cDNA sequences from Crepis spp. and Vernonia galamensis that encode fatty acid Δ12-epoxygenases. The genetic sequences of the present invention provide the means by which fatty acid metabolism may be altered or manipulated in organisms, such as, for example, yeasts, moulds, bacteria, insects, birds, mammals and plants, and more particularly in plants. The invention also extends to genetically modified oil-accumulating organisms transformed with the subject genetic sequences and to the oils derived therefrom. The oils thus produced provide the means for the cost-effective raw materials for use in the efficient production of coatings, resins, glues, plastics, surfactants and lubricants.

Description

RELATED APPLICATION DATA [0001] This application is a continuation-in-part application of U.S. Ser. No. 09 / 059,769 filed on Apr. 14, 1998, which claims benefit of priority under Title 35, U.S.C. §119 from Australian Patent Application No. P06223 filed on Apr. 15, 1997 and Australian Patent Application No. P06226 filed on Apr. 15, 1997, and which also claims benefit of priority under Title 35, U.S.C. §119(e) from U.S. Ser. No. 60 / 043,706 filed on Apr. 16, 1997 and from U.S. Ser. No. 60 / 050,403 filed on Jun. 20, 1997.FIELD OF THE INVENTION [0002] The present invention relates generally to novel genetic sequences that encode fatty acid epoxygenase enzymes. In particular, the present invention relates to genetic sequences that encode fatty acid Δ12-epoxygenase enzymes as defined herein. More particularly, the present invention provides cDNA and genomic gene sequences that encode plant fatty acid epoxygenases, in particular from Crepis palaestina or Vernonia galamensis. The genetic seque...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01H5/10C12N9/02C12N15/82C12P7/6472
CPCC12N9/0004C12N9/0071C12P7/6472C12P7/6409C12P7/6427C12N15/8247
Inventor GREEN, ALLANSINGH, SURINDERLENMAN, MARITSTYMNE, STEN
Owner COMMONWEALTH SCI & IND RES ORG
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